package com.liuwa.framework.config;

import com.liuwa.common.utils.spring.SpringUtils;
import com.liuwa.framework.security.annotation.AnonymousAccess;
import com.liuwa.framework.security.annotation.PermitAllAccess;
import com.liuwa.framework.security.filter.JwtAuthenticationTokenFilter;
import com.liuwa.framework.security.handle.AuthenticationEntryPointImpl;
import com.liuwa.framework.security.handle.LogoutSuccessHandlerImpl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.http.HttpMethod;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.springframework.security.web.authentication.logout.LogoutFilter;
import org.springframework.web.filter.CorsFilter;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;

import javax.annotation.security.PermitAll;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 * spring security配置
 * 
 * @author liuwa
 */
@EnableGlobalMethodSecurity(prePostEnabled = true, securedEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter
{

    private Logger logger = LoggerFactory.getLogger(getClass());

    /**
     * 自定义用户认证逻辑
     */
    @Autowired
    private UserDetailsService userDetailsService;
    
    /**
     * 认证失败处理类
     */
    @Autowired
    private AuthenticationEntryPointImpl unauthorizedHandler;

    /**
     * 退出处理类
     */
    @Autowired
    private LogoutSuccessHandlerImpl logoutSuccessHandler;

    /**
     * token认证过滤器
     */
    @Autowired
    private JwtAuthenticationTokenFilter authenticationTokenFilter;

    @Autowired
    private SmsAuthenticationSecurityConfig smsAuthenticationSecurityConfig;

    @Autowired
    private AutoLoginAuthenticationSecurityConfig autoLoginAuthenticationSecurityConfig;
    
    /**
     * 跨域过滤器
     */
    @Autowired
    private CorsFilter corsFilter;
    
    /**
     * 解决 无法直接注入 AuthenticationManager
     *
     * @return
     * @throws Exception
     */
    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception
    {
        return super.authenticationManagerBean();
    }

    /**
     * anyRequest          |   匹配所有请求路径
     * access              |   SpringEl表达式结果为true时可以访问
     * anonymous           |   匿名可以访问
     * denyAll             |   用户不能访问
     * fullyAuthenticated  |   用户完全认证可以访问（非remember-me下自动登录）
     * hasAnyAuthority     |   如果有参数，参数表示权限，则其中任何一个权限可以访问
     * hasAnyRole          |   如果有参数，参数表示角色，则其中任何一个角色可以访问
     * hasAuthority        |   如果有参数，参数表示权限，则其权限可以访问
     * hasIpAddress        |   如果有参数，参数表示IP地址，如果用户IP和参数匹配，则可以访问
     * hasRole             |   如果有参数，参数表示角色，则其角色可以访问
     * permitAll           |   用户可以任意访问
     * rememberMe          |   允许通过remember-me登录的用户访问
     * authenticated       |   用户登录后可访问
     */
    @Override
    protected void configure(HttpSecurity httpSecurity) throws Exception
    {

        Map<RequestMappingInfo, HandlerMethod> handlerMethods =
                SpringUtils.getBean(RequestMappingHandlerMapping.class).getHandlerMethods();
        Set<String> anonymousUrls = new HashSet<>();
        Set<String> permitAllUrls = new HashSet<>();
        for (Map.Entry<RequestMappingInfo, HandlerMethod> infoEntry : handlerMethods.entrySet()) {
            HandlerMethod handlerMethod = infoEntry.getValue();
            AnonymousAccess anonymousAccess = handlerMethod.getMethodAnnotation(AnonymousAccess.class);
            if (anonymousAccess != null) {
                anonymousUrls.addAll(infoEntry.getKey().getPatternsCondition().getPatterns());
            }

            PermitAllAccess permitAllAccess = handlerMethod.getMethodAnnotation(PermitAllAccess.class);
            PermitAll permitAll = handlerMethod.getMethodAnnotation(PermitAll.class);
            if (permitAllAccess != null || permitAll != null) {
                Set<String> patterns = infoEntry.getKey().getPatternsCondition().getPatterns();
                for(String pattern : patterns){
                    if(pattern.contains("{") && pattern.contains("}")){
                        pattern = pattern.replaceAll("\\{\\w+\\}", "**");
                    }
                    permitAllUrls.add(pattern);
                }

            }


        }
        anonymousUrls.forEach(s -> logger.info("匿名访问的url：{}", s));
        permitAllUrls.forEach(s -> logger.info("不限制访问url：{}", s));

        String[] anonymousPatterns = anonymousUrls.toArray(new String[0]);
        String[] permitAllPatterns = permitAllUrls.toArray(new String[0]);




        httpSecurity
                // CSRF禁用，因为不使用session
                .csrf().disable()
                // 认证失败处理类
                .exceptionHandling().authenticationEntryPoint(unauthorizedHandler).and()
                // 基于token，所以不需要session
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS).and()
                // 过滤请求
                .authorizeRequests()
                // 对于登录login 注册register 验证码captchaImage 允许匿名访问
                .antMatchers("/**/login", "/**/register", "/login", "/register").anonymous()
                .antMatchers(
                        HttpMethod.GET,
                        "/",
                        "/*.html",
                        "/**/*.html",
                        "/**/*.css",
                        "/**/*.js",
                        "/profile/**"
                ).permitAll()
                .antMatchers("/common/regions","/captcha/**").permitAll()
                .antMatchers("/swagger-ui.html").anonymous()
                .antMatchers("/swagger-resources/**").anonymous()
                //.antMatchers("/webjars/**").anonymous()
                .antMatchers("/*/api-docs").anonymous()
                .antMatchers("/druid/**").anonymous()
                .antMatchers(anonymousPatterns).anonymous()
                .antMatchers(permitAllPatterns).permitAll()
                // 除上面外的所有请求全部需要鉴权认证
                .anyRequest().authenticated()
                .and()
                .headers().frameOptions().disable();

        httpSecurity.logout().logoutUrl("/logout").logoutSuccessHandler(logoutSuccessHandler);
        // 添加JWT filter
        httpSecurity.addFilterBefore(authenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);
        // 添加CORS filter
        httpSecurity.addFilterBefore(corsFilter, JwtAuthenticationTokenFilter.class);
        httpSecurity.addFilterBefore(corsFilter, LogoutFilter.class);

        // 短信验证码登录 配置
        httpSecurity.apply(smsAuthenticationSecurityConfig);

        // 自动登录 配置
        httpSecurity.apply(autoLoginAuthenticationSecurityConfig);
    }



    /**
     * 强散列哈希加密实现
     */
    @Bean
    public BCryptPasswordEncoder bCryptPasswordEncoder()
    {
        return new BCryptPasswordEncoder();
    }

    /**
     * 身份认证接口
     */
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception
    {
        auth.userDetailsService(userDetailsService).passwordEncoder(bCryptPasswordEncoder());
    }
}
